316L不锈钢单轴疲劳动态应变的时效分析*

doi:10.11901/1005.3093.2015.196

材料研究学报

2016, Vol. 30

Issue (7): 496-502 DOI: 10.11901/1005.3093.2015.196

本期目录 | 过刊浏览

316L不锈钢单轴疲劳动态应变的时效分析*

金丹(

), 李江华, 田大将

沈阳化工大学能源与动力工程学院沈阳 110142

Dynamic Strain Aging of 316L Stainless Steel During Uniaxial Fatigue Process at 600℃

JIN Dan^**(

), LI Jianghua, TIAN Dajiang

School of Energy and Power Engineering, Shenyang University of Chemical Technology, Shenyang, 110142, China

引用本文:

金丹, 李江华, 田大将. 316L不锈钢单轴疲劳动态应变的时效分析*[J]. 材料研究学报, 2016, 30(7): 496-502.
Dan JIN, Jianghua LI, Dajiang TIAN. Dynamic Strain Aging of 316L Stainless Steel During Uniaxial Fatigue Process at 600℃[J]. Chinese Journal of Materials Research, 2016, 30(7): 496-502.

全文: PDF(3991 KB) HTML

摘要:

进行了316L不锈钢在600℃不同应变条件下的单轴低周疲劳实验。结果表明, 材料在三个应变范围下均表现出了动态应变时效(DSA)现象, 采用“应力跌幅”的概念比较了不同应变范围的锯齿屈服程度, 通过可动位错与扩散的溶质原子间不同形式的交互作用分析了此现象, 讨论了最大应力跌幅的循环硬化及循环软化的相关性。DSA现象有明显的循环周次相关性, 循环初期DSA现象明显, 随后逐渐减弱甚至消失, 但是在失效前DSA现象再次出现, 气团形式的不同造成了不同循环周次下DSA现象的差异。在低应变范围DSA现象仅表现出了A型锯齿波, 在高应变范围不同周次及同一周次的不同阶段波型表现为A、B、A+B、C及B+C型。最后, 采用SEM分析了疲劳断口的裂纹源区和扩展区。

关键词 ：金属材料, 316L不锈钢, 动态应变时效(DSA), 应力跌幅, 锯齿波, 原子气团

Abstract：

Low cycle fatigue tests for different strain ranges were conducted for 316L stainless steel at 600℃ under uniaxial loading. The results show that the dynamic strain aging (DSA) can be observed for three strain ranges. The concept of stress drop has been introduced to characterize the degree of serrated yielding for different strain ranges. The difference in the serrated yielding amount for different strain ranges can be attributed to the different interactions between solute atoms and dislocations. The maximum stress drop is related to the cyclic hardening or cyclic softening. DSA is related to the number of cycles. The material presents the obvious DSA for a few cycles and then followed by weak serrated yielding, even disappearing. However, the serrated yielding can be observed again before fatigue failure. The difference of serrated yielding can be attributed to the types of atom atmospheres at different cycles. A-type serrated wave was observed for smaller strain range, however, types of A, B, A+B, C, and B+C serrated wave can be found for different cycles and different phases in one cycle for larger strain range. Finally, the crack source region and crack propagation region of the fatigue fracture were observed by SEM.

Key words： metallic materials 316L stainless steel dynamic strain aging(DSA) stress drop serrated wave atom atmospheres

收稿日期: 2015-07-31

基金资助:* 国家自然科学基金11102119和国家重点基础研究发展计划2011CB706504资助项目

作者简介: null

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https://www.cjmr.org/CN/10.11901/1005.3093.2015.196 或 https://www.cjmr.org/CN/Y2016/V30/I7/496

图1 试件的形状及几何尺寸(mm)

表1 材料化学成分

图2 不同应变范围下半寿命滞回线

图3 最大应力跌幅与循环周次关系和不同循环周次的最大应力值

图4 不同周次下Δε=0.7%的滞回线

图5 不同周次下Δε=1.0%的滞回线

图6 不同周次下Δε=1.2%的滞回线

图7 不同应变范围下裂纹源区SEM结果

图8 不同应变范围裂纹扩展区SEM结果

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